Posts I've Made

Mike, i understand that you want to get normal TTL exposure at fast serial shooting camera mode ("Continuos shooting mode"), maybe 3fps - 7fps or faster. You don't like 1-2 seconds interval for Z240 recharging for accurate TTL. i can understand it.

Did you try such fast serial shooting mode with Z240 TTL in the past? Because, using Z240 strobe in TTL mode, Independently of anything, every next shot in fast series has significantly less lighting than previous shot, - Z240 does not have enough time for recharging and it causes different pre-flash (and different main flash) at every next shot. The idea of TTL metering does not work normally for serial shooting with small uw strobes.

People usually shoot in "single shot" camera mode with Z240 TTL to get accurate TTL exposure. This is independently of camera brand and TTL-Converter brand.

But Ok, you can find any TTL-converter which has very short pre-flash (Nikon, or other), and get 2-3 shots by Z240 this way in series, but it will not be normal TTL exposure (very different flash exposure for all 3 shots).

Hi Pavel. After I returned home from my trip with the UW Technics TTL board, I did a comparison bench test, using both the Technics board and the onboard strobe taking rapid secession shots. I did not get the same results you describe above, the three shots I took with the onboard flash TTL all seemed to be exposed exactly the same. I made a video of this test to send to my dealer to help explain the trouble I was having. I can post the vids here if you like.

Thank you Buddy! I immediately called my dealer to ask whether these could be adapted to my Nauticam housing, turns out these are the same UW Technics circuitry just fitted to Subal. But I do appreciate the idea just the same.

Hi Pavel, thanks for the reply. Are you with UW Technics? Everything you said is correct and I understand. However, if you use the onboard strobe in TTL mode, you can shoot continuously until the recharge time of the camera strobe starts to lag. So it is clearly possible for the Z240's to be able to shoot continuously in TTL, but it seems the Technics product had not been able to replicate the Canon TTL exactly.

Some photographers may find the lag time between shots to be acceptable, but for me, having to count in my head between frames to be sure I get a properly exposed shot is not something I can live with. And I counted at least 2 full seconds lag with the UW Technics board.

It seems to work well other than the lag, so if you have strobes that are compatible it would be very useful. But I'm still looking for something that works properly with my 240s (now 330s).

I would suggest to UW Technics that they mention in their user manual this issue with lower powered strobes. I spent an awful lot of time on my trip trying to figure out why it was not working properly.